If y velocity > x velocity in 2-button mode, go to recents

Also, when landing in recents, snap to the nearest page so that swipe up
consitently goes to task 0 instead of sometimes scrolling to task 1.

Bug: 133518678
Change-Id: I63a161a9f1f87266d3c3fc71c98cd5fc5e2f8874
1 file changed